Active Polarization Control in Integrated Photonics via TE00–TM00 Conversion

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Solution Overview

Problem

Existing integrated photonics systems struggle to convert and control the polarization of optical signals on a single chip, as traditional methods require off-chip formation of the desired polarization, which is not compatible with fully integrated photonics.

Innovation Solution

A polarization controller that splits an input optical signal into two signals, independently controlling their amplitude and phase, and combines them using a mode converter/hybridizer to achieve any desired polarization on the Poincare sphere, employing thermo-optic, electro-optic, or piezoelectric effects, and utilizing waveguide structures with specific geometries and materials to convert between TE00 and TM00 modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional two-waveguide polarization control method is used, then polarization control capability is achieved, but the output signal is formed off-chip which is not compatible with fully integrated photonics

Engineering Contradiction:

Improvepolarization control capabilityVSAvoidintegrated photonics compatibility

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the polarization control functionality with on-chip waveguide structures by combining mode converters and hybridizers into a single integrated device. The mode converter transforms TE00 mode to TM00 mode, and the hybridizer combines these modes to achieve arbitrary polarization states, all within the chip structure rather than requiring off-chip formation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent transitions from conventional two-waveguide spatial arrangement to a multi-mode approach within a single waveguide structure. By utilizing different mode dimensions (TE00, TM00, TE10) within the same physical waveguide, the system achieves polarization control without requiring separate waveguides and off-chip combination.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If mode converter and hybridizer are integrated on-chip, then fully integrated photonics compatibility is achieved, but device complexity increases

Engineering Contradiction:

Improveintegrated photonics compatibilityVSAvoidstructure complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent designs the mode converter and hybridizer to serve multiple functions within a single integrated structure. The same waveguide structures that guide the optical signals also perform mode conversion and hybridization functions, eliminating the need for separate dedicated components and reducing overall device complexity despite the multifunctional requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If independent amplitude and phase control is implemented, then arbitrary polarization on Poincare sphere is achieved, but control system complexity increases

Engineering Contradiction:

Improvepolarization state controlVSAvoidcontrol system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent employs self-service mechanisms where the optical signals themselves carry the control information. By encoding amplitude and phase modulation directly into the optical fields that propagate through the mode converter and hybridizer, the system achieves independent control of polarization states without requiring external complex control electronics, as the optical fields autonomously interact with the waveguide structures to produce the desired polarization outcomes.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables on-chip conversion of optical signals to any desired polarization, breaking symmetry for efficient power transfer and short device size, maintaining compatibility with integrated photonics.

Implementation Method 1

a mode converter (the mode converter receives the second of the third pair of intermediate optical signals, converts the second of the third pair of intermediate optical signals from a TE00 mode to a TE10 mode, and outputs the second of the third pair of intermediate optical signals in the TE10 mode)

Methodology Applied

Scientific EffectMode conversion: Waveguide (optics)

Implementation Method 2

a mode hybridizer (the mode hybridizer receives the second of the third pair of intermediate optical signals in the TE10 mode, converts the second of the third pair of intermediate optical signals from the TE10 mode to the TM00 mode thereby forming the fourth intermediate optical signal, and outputs the fourth intermediate optical signal)

Methodology Applied

Scientific EffectMode hybridization: Waveguide (optics)